Volcanoes Flashcards
1
Q
What is a fissure?
A
Any natural opening in the Earth’s crust.
2
Q
When is a fissure a volcano?
A
When melted rocks, ash, gases and steam come out.
3
Q
Where does pressure for a volcano come from?
A
The pressure comes from hot magma and gases that build up below the earth’s surface.
4
Q
What are fissure eruption?
A
They occur when molten rock flows through cracks in the earth’s crust and floods the surrounding surface.
5
Q
What are rift valleys?
A
Areas where continental plates stretch and thin over a long period of time.
